﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Калькулятор : Form
    {
        

        private string firstNumber;
        string Action;

        public Калькулятор()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text += "1";
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text += "2";
        }

        private void button3_Click(object sender, EventArgs e)
        {
            textBox1.Text += "3";
        }

        private void button4_Click(object sender, EventArgs e)
        {
            textBox1.Text += "4";
        }

        private void button5_Click(object sender, EventArgs e)
        {
            textBox1.Text += "5";
        }

        private void button6_Click(object sender, EventArgs e)
        {
            textBox1.Text += "6";
        }

        private void button7_Click(object sender, EventArgs e)
        {
            textBox1.Text += "7";
        }

        private void button8_Click(object sender, EventArgs e)
        {
            textBox1.Text += "8";
        }

        private void button9_Click(object sender, EventArgs e)
        {
            textBox1.Text += "9";
        }

        private void button10_Click(object sender, EventArgs e)
        {
            textBox1.Text += "0";
        }

        private void button12_Click(object sender, EventArgs e)
        {
            firstNumber = textBox1.Text;
            Action = "+";
            textBox1.Text = "";

        }

        private void button11_Click(object sender, EventArgs e)
        {
            int a  = Convert.ToInt32(firstNumber);
            int b = Convert.ToInt32(Action);

            (a + b).ToString();

        }
    }
}
